“Daddy @realevanross and my brother @rossnaess. It was an amazing night. #babyshower,” the mom-to-be captioned a photo of her sitting on a moon cut-out under a sky of hanging stars.

The couple announced they were expecting a baby together in December — and told PEOPLE exclusively in February that it was a girl! But despite already being mom to 6½-year-old son Bronx Mowgli, Simpson admitted everything felt like a whole new experience.

When his wife Nicole “Coco” Austin came running down the stairs crying one day, Ice-T immediately froze. The rapper turned actor assumed there had been a tragedy in the family.

“I took the test and when I found out, I ran downstairs. He was on the computer and I was bawling, screaming. He thought someone died,” she tells PEOPLE.

But it turns out they were happy — and nervous — tears: Austin was pregnant! “He was just as surprised as me,” she admits of finding out they were expecting their first child together.

“I was so thrown off that our pregnancy happened really fast,” Austin, 36, shares. “It happened out of the blue, and I was like, ‘Wow, wait a second!’ I was told it was going to take a lot longer than it [did] so it threw me off.”

“This will be a new chapter in our lives,” he wrote. “We’ve already been so fortunate for the opportunity to touch people’s lives around the world — Cilla as a doctor and educator, and me through this community and philanthropy. Now we’ll focus on making the world a better place for our child and the next generation.”

“We’ve been trying to have a child for a couple of years and have had three miscarriages along the way.

“You feel so hopeful when you learn you’re going to have a child. You start imagining who they’ll become and dreaming of hopes for their future. You start making plans, and then they’re gone. It’s a lonely experience. Most people don’t discuss miscarriages because you worry your problems will distance you or reflect upon you — as if you’re defective or did something to cause this. So you struggle on your own.